Polyphase magnetic separator.



H. L. ISBELL.

POLYPHASE MAGNETIQ SEPARATOR.

APPLICATION FILED MAY 3 1912.

1,066,619. Patented July 8,1913.

2 SHEETSSHEET 2.

J4 INVEN r09 WITNESSES: 7 W HL.[$BELL ATTORNEYS UNITED STATES PATENT OFFICE.

HOWARD L. ISBELL, F NAUGATUCK, CONNECTICUT, ASSIGNOR TO THE AMERICAN BRASS COMPANY, OF WATERBURY, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

POLYPHASE MAGNETIC SEPARATOR.

To all Il /(.0717. it may concern:

Ile it known that I; ITOWARD L. Isnnnn, a citizen of the United States, residing at Naugatnck, New Haven county, State of Connecticut, have invented certain new and useful Improvements in Polyphase Mag netic Separators, of which the following is a full, clear, and exact. description.

My invention relates to polyphase magnetic separators, and has vtor its object to produce a simple and convenient electro magnetic separator of table form adapted to be made in large sizes and also in sizes so as to be portable and be capable of use as bench plates.

It is particularly useful for separating magnetic particles from brass or other nonmagnetic scrap, or separating small iron articles from. brass articles or from brass scrap.

Another object is to produce a magnetic separator which has no rotating member.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, in which- Figure 1 shows a plan view of the separator plate when placed in a horizontal position, portions being broken away. Fig. 2 is a side elcvationof the left-hand end of the same. Fig. 3 is a plan view of the-left hand end of the same with certain parts, including the carrier plate, removed. Fig. 4 is an end view of the core with the lefthand coil shown in place. Fig; 5 is an end View of the core with the right-hand coil in place. Fig. 6 is a longitudinal section on the line aca' Fig. 3. Fig. 7 is a cross section of one of the coils on the line a::v, Fig. 3. Fig. 8 shows the separator mountin on a support so as to be inclined at an angle, being in section on the line 3/- i/, Fig. 3, with the ends of the coils broken 06. Fig. 9 is a diagram of the winding. Fig. 10 shows in detail one of the coils of the winding.

Referring more particularly to the drawings: 1 is a laterally and longitudinally extending core made up of vertically disposed laminations,-the same being built up of thin sheets of iron after'the-manner of armature cores. These laminationsare held together by rods 2. The upper surface of this core is pro vidednvitha series of-slots 3, the/projections between them having undercuts t.

Specification of Letters Patent.

Application filed May 3, 1912.

Patented July 8. 1913. Serial No. 694,991.

Located in the slots are orerlapping coils 5 constituting windings extending transversely from one side to the'other and con nectcd together as shown .in Fig. 9 so that, when traversed by suitable alternating currents, a series of longitudinally moving magnetic fields are produced, the connections being similar to the connections of the coils upon an inductor of a polyphase motor. While two phase windings and currents may be used, for the purposes of illustration the winding shown as one adapted for three-phase currents, the terminals (36 belonging to one phase, 77 belonging to another phase, and S-8 be longing to the third phase. The coils 5 in the body of the core are all of the same shape and disposed in the same way. The coil 5' at the left-hand end, however, is a flat coil, as shown in Fig. 4, having one limb in a notch formed in the vertical slotof the core. The bottom portions of the first two lefthand vertical slpts of the core are empty. The coil at the right-hand end of the core is of the same shape as the coil 5, but has its right-hand limb in a notch formed in the vertical face of the core similar to the notch in which the left-hand limb-of the coil. 5 lies. The upper portion of the two right-hand slots in the face of the core are left empty. All the slots or recesses containing coils are provided with the undercuts retain the coils inplace, and also to protect them and to provide an even surface on the face ofthe core. Above the upper face of the core and in close proximity thereto so that scrap upon said cover will be magnetically acted upon, is a cover 10 of nonmagnetic material such as fiber, extending over the face of the core and preferably over the exposed ends of the coils. While, for some purposes, this cover may be stationary, I provide means whereby it may be given a slight vibration or agutation in order to assist in the separation of the magnetic and non-magnetic bodies. F onthis purpose, I provide the core with pins" 11 which pass through openings in magnetic armatures 12, which are secured to the ends of the cover 10. I also provide springs 13 surrounding the pins, and bearing against corresponding surfaces of the armatures =12. 'In the pres ent instance, they are shown as hearing friction of the matter to be treated.

against the outside surfaces of these armatures. These springs are preferably such that their natural period of oscillation coincides with the frequency of the alternating 5 current in such a manner that their natural rate of acticn will coincide with the tendency of the armature to more under the magnetic attraction and release of the arinatures upon which they act. \Vith the 19 winding shown, the arinatures at the two ends will not he sin'iultaneousl ,fitil'tlClCtl by a maximum magneticlield, but willbe alternately attracted by such a field.

In some instances, a separating table may 5 be used to advantage in a. horizontal posiport. 14 having an upright 15 and a stop 16.

The coils 5-55' constituting polyphase windings of any suitable character, are connected to roper terminals of a corresponding polypfiase circuit. In the device 3 illustrated the windings, being tbree-phasc windings, are connected 'lIi any ordinary manner, such as the Y-connection, to-condiictors leading from a three-phase generator 17, so as to produce successive waves of niagnetism beginning at one end of the table and disappearing at the other end of the table, similar to the waves of magnetism that would be produced by a series of permanent horseshoe magnets arranged in the 40 same plane and being moved from one end of the table to the other; With the winding shown in Fig. 9 there are six positive fields and six negative fields on the surface of the, At the same time I have found that 5.three-phase currentsdiaving a frequency of Core.

7200 alternations per. minute are well adapted for the purpose.

The operation is as follows: The device being connected in circuit, the scrap to be .50 treated is discharged a little at a time upon the cover 10. This discharge may be intermittent, or, if desired;continuous. The moving waves of magnetism will cause the magnetic particles to move along the table in one direction, the brass particles remaining stationary if the cover is stationary. If the separator is inclined at an angle, as shown in Fig. 8, the non-magnetic particles will tend to move toward the lower edge of the cover. When the cover is agitatedftho tendency of the brass Particles to move to ward the lower edge of the cover will be assisted, with the result that the brass particles will slide off the lower edge of the table at one portion, while the magneticparticlcs will be carried along toward the other end of the table before they are discharged. It the i'l'iiiglifillOfiGlLl is traveling from left to right, 1 preferably discharge the mixture to be treated on the upper left-hand portion of the cover 10, whereupon, the noniiiagiietic particles will be discharged from the lower edge of that portion, while the magnetic particles will be discharged from the edges of the right-hand portion.

Any suitable means for agitating the cover 10 may be provided, but the means shown are sufficient. The windings of the core are so arranged that the left-hand end of the core is magnetized to its maximum when the right-hand end of the core is not sovinagnetized, and vice versa. Furthermore, distinct magnetic poles are alternately formed at the two ends by reason of the fact that the coils 5 and 5 extend over the edges of the. core into the end slots as shown. When, therefore, a maximum pole is formed at the left-hand end, the magnetism acts upon the left-hand armature 12, giving it and the table connected thereto, a jerk to the right. \Vhen a maximum magnetic pole is formed at the right-hand end of the core,

'the.right-handarmature 12 is acted upon and, together-with the cover connected thereto, is given a movement toward the left. This movement may be supplemented by mechanical means indicated at 12. If de-' sired, the portions 12 may be made of nonmagnetic material and theagitation produced entirely by means of themechanical connection 12.

While the above is a description of the preferred embodiment of my invention, it will be obvious to those skilled in the art that various modifications of the same may be made without departing from the spirit of my invention or the scope of the ap pended claims.

. What I claim is:

1. In a device of thecharacter described, the combination of a laterally and longi-. tudinally extending magnetic core, multiphase windings thereon producing when energized a magnetic field traveling longitudinally along said core and a longitudinally movable non-magnetic cover above the upper surface of said core constituting a support for the material to be separated,

and means for imparting t0 said cover a longitudinal reciprocating movement.

2. In a device of the character described,

the combination of a laterally and longituportion of the end face of said core and producing at said end face an alternating free magnetic pole of maximum intensity and a nonmagnetic cover above the upper siir face of said core constitutin a support for the materialito be separate an armature connected to said cover and located in the field of said free magnetic field, and a spring for retracting said armature.

3. In a device of the character described,

the combination of a laterally and longitui dinally extending magnetic core, multiphase windings thereon producing when energized a magnetic field traveling longitudinally along said core, said winding embracing a portion of the end faces of said core and producing at said end faces alternately free magnetic poles of maximum intensity, a non-magnetic cover above the upper surface of said core constituting a support for the material to be separated and armatures connected to said cover and located within the fields of said poles respectively.

4. In a device of the character described, the combination of a laterally and longitudinally extending magnetic core, multiphase windings thereon producing when energized a magnetic field traveling longitudinally alon said core, said winding embracing a portion of the end faces of said core and producing at said end faces alternately free magnetic poles of maximum intensity, a nonmagnetic cover above the upper surface of said core constituting a support for the material to be separated and armatures connected to said cover and located within the fields of said poles respectively, and springs for retracting the armatures when attracted by their respective fields. g

5. In a device of the character described, the combination of a laterally and longitudinally extending magnetic core, multiphase windings thereonv producing when energized a magnetic field traveling longitudinally along said core, the upper surface of said core being inclined in a direction transverse to the series of coils, a longitudinally movable non-magnetic cover for said core constituting a support for the material to be se 'iarated, and means for reciprocating said cover longitudinally.

HOWARD L. ISBELL.

\Vitnesses QI'INN 'lnonrsos, F. F. Mnmirr'r. 

